Allen Bradley Pots are very good pots, 2Watt Carbon
Type J have a few different tapers, Linear, Audio and Log.
Standard Mil-Spec AB pots are Marked with a RV4 number
and retail in the 6-8 dollar area. If they have a RV4 # you
can look them up and see the taper. other than that you'll
have to use an ohm meter...........
Steve @ Apex Jr.